This is an unhappy expression, bringing in the name of God where it does not occur. In the O.T. it is chalilah, 'far be it.' Ge 44:7,17, etc. In the N.T. ?? ???????, 'let it not be.' Ro 3:4,6,31, etc.
Certainly not! Let God be true, though every man a liar. As it is written: "That you may be justified in your words and prevail when you are judged."
Certainly not! For then how could God judge the world?
Do we then nullify the law by this faith? Certainly not! On the contrary, we uphold the law.